$num: 200;

.zmd-three-box {
    width: 100%;
}

.zmd-three-item {
    width: 50px;
    height: 50px;
    margin: 0 auto;
    text-align: center;
    transform: translateX(-500px);
    transition: 1s;
}

.three-item {
    transform: translateX(0);
}